/**
 * 
 * Copyright (C) 2011 Cody Stoutenburg . All rights reserved.
 *
 *       This program is free software; you can redistribute it and/or
 *       modify it under the terms of the GNU Lesser General Public License
 *       as published by the Free Software Foundation; either version 2.1
 *       of the License, or (at your option) any later version.
 *
 *       This program is distributed in the hope that it will be useful,
 *       but WITHOUT ANY WARRANTY; without even the implied warranty of
 *       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *       GNU Lesser General Public License for more details.
 *
 *       You should have received a copy of the GNU Lesser General Public License
 *       along with this program; if not, write to the Free Software
 *       Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. 
 * 
 */
package net.alteiar.plateform.gui;

import java.util.concurrent.TimeUnit;

import net.alteiar.plateform.game.SystemTimer;
import net.alteiar.plateform.game.World;

/**
 * @author Cody Stoutenburg
 * 
 */
public class RunnableGameLogic implements Runnable {

	private final long gameWaitForDuration;
	private final long gameUpdateInMs;
	private final boolean gameRunning;

	private final World world;

	public RunnableGameLogic(World world, long gameUpdatePerSec) {
		this.world = world;
		this.gameWaitForDuration = SystemTimer.getTimeUnit().convert(1,
				TimeUnit.SECONDS)
				/ gameUpdatePerSec;
		gameUpdateInMs = TimeUnit.MILLISECONDS.convert(1, TimeUnit.SECONDS)
				/ gameUpdatePerSec;

		this.gameRunning = true;
	}

	@Override
	public void run() {
		long lastLoopTime = System.currentTimeMillis();

		// keep looping round til the game ends
		while (gameRunning) {
			// work out how long its been since the last update, this
			// will be used to calculate how far the entities should
			// move this loop
			lastLoopTime = SystemTimer.getTime();

			world.update(gameUpdateInMs);

			// finally pause for a bit. (gameWaitForDuration)
			SystemTimer.sleep(lastLoopTime, gameWaitForDuration);
		}
	}
}
